On 24 Apr, Richard Coleman wrote: > Don Lewis wrote: >>>>At least the -current version of tar skips reading the >>>>data when it is writing to /dev/null. >>> >>>A-ha! That explains a few of the odd timings I've seen. >>>I wonder why it does that? (Other than to look good on >>>benchmarks, of course. ;-) >> >> >> This speeds up Amanda quite a bit. Amanda will run tar with the >> --totals option as well as other options to specify either full or >> incremental backups multiple times for each file system that it backs >> up. It does this to plan the best mixture of full and incremental >> backups. If tar actually read the data from disk each time, the >> planning phase would take a *lot* longer, and would thrash the disk a >> lot more. > > Until libarchive gets support for sparse files, it's probably better to > stick with gtar or rdump with Amanda. The incremental backup capabilities that gtar has would be a lot more useful for Amanda than sparse file support. > But the concept of a version of Amanda that natively uses libarchive is > very cool. It seems like a natural target. Especially with ACL support.Received on Sat Apr 24 2004 - 12:08:18 UTC
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